Pocket e-books. It's not really hard to do without practice.

In the past two days, you can see that the upload speed of basic calculus mini-books has obviously increased. In just two days, the postscript, preface, Introduction (first and second) of basic calculus and the contents of the book have been uploaded. At this moment, as long as you search for keywords, such as "basic calculus preface", then this part of content will be immediately in front of your eyes.

Pocket e-books have one of the most notable features. They can be divided into statements, paragraphs, and freely copied and downloaded. No one sets the copy barrier and will never become a "copper stinking text". That is to say, the content of a pocket e-book will exist on the Internet for a long time, for example, for 30 to 40 years. Therefore, pocket e-books must be excellent text and maintained by a dedicated team, similar to Wikipedia.

What should I do next for a pocket ebook? We will upload the index of basic calculus, which is a comparison between Chinese and English. In addition, every term (or concept) in mathematics is accompanied by the source of the original text, so that readers can see at a glance and are willing to refer to it. This project is huge, but we want to go through this "zhuqiao". That is to say, as long as you search for keywords, such as unit parks and radians, related definitions (as a separate electronic file) will appear in front of you.

J. Keisler's basic calculus textbook contains 1500 terms, basically covering all the contents of calculus. That is to say, as long as you search for a terminology related to calculus, the search results will immediately point to the basic calculus tutorial. At that time (September 1 this year), people will know the power of pocket e-books.

Some people are reluctant to accept the original English documents. Fifty years ago, we used original foreign language teaching materials to learn mathematics. Why is it worse after Fifty Years? How many high school students do not know English? In fact, we are going to release the Chinese version of calculus, but that is the next step. Some people do not agree with the recommended infinitesimal method, so do not study the super real number * R. Continue to mix it with the original real number R!

In fact, text transcription is very hard. However, if one person had a hard time in exchange for tens of thousands of people (for decades), why not?